Title:
TEMPERATURE COMPENSATION TYPE PIZO- ELECTRIC OSCILLATOR
Document Type and Number:
Japanese Patent JPH01108801
Kind Code:
A
Abstract:
PURPOSE: To reduce the rotational effect of a correction curve for resetting frequency by connecting a frequency adjusting circuit for adjusting frequency in accordance with temperature to the terminal of a variable capacity element through a device of which gain is changed in accordance with reset voltage supplied by a frequency correcting circuit. CONSTITUTION: Temperature compensation voltage Vc is impressed to the cathod of a variable capacity diode D through a device of which gain is changed in accordance with reset voltage and the reset voltage is changed with the lapse of time. The device is provided with an operational amplifier A1 , the non- inverted input of the amplifier A1 receives the voltage V from a frequency adjusting circuit CT and the inverted input of the amplifier A. receives voltage corresponding to the reset voltage. The received voltage is applied by a voltage divider bridge, the inverted input is connected to power supply voltage VA through a resistor R3 and connected also to earth through a resistor R2 and a variable resistor R1 . A negative feedback resistor R is connected between the output of the amplifier A1 and its inverted input. Consequently the rotational effect of a correction curve can be reduced.
Inventors:
JIERAARU MAROTERU
Application Number:
JP24587388A
Publication Date:
April 26, 1989
Filing Date:
September 29, 1988
Export Citation:
Assignee:
CEPE
International Classes:
H03B5/32; H03L1/00; H03L1/02; (IPC1-7): H03B5/32
Attorney, Agent or Firm:
Takashi Koshiba